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Test readings, control module connections

Test readings, control module connections




Scope

Values and directions for measuring control module voltages can be found under the relevant heading.

Remember:


• Note the test conditions and use common sense when assessing the test result.

• The specified values are with the ignition ON unless otherwise stated.

• First check that the control module has a power supply and is grounded.

• Then check all sensor inputs and signals from other systems.

• Finally, check the control module outputs. Remember that the values do not indicate whether the actuator unit is working.

• If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.

• The test readings given apply to a calibrated Fluke 88/97.

• Test readings in %(+) and ms(+) show the pulse ratio and pulse duration of the signal. A test instrument capable of giving pulse ratio and pulse duration readings must be used. The (+) sign indicates a positive trigger pulse, TRIG+.



Main unit connections (contacts A, B, C)


> =greater than ; < = less than ; ~ = alternating current

(LP: LOGIC PROBE P = select pulse ; p = visible pulses

Connector (A)

Pin No.

Cable colour

Component/

function

In/out

Test conditions

Across

Test reading

See

1



No connection











2



No connection











3

RD/BN

Telephone mute

In

No telephone call.



Telephone call.

3(A)-8(A)



3(A)-8(A)

4-6 V



<2 V

Telephone system



4

BN/RD

Power supply (+15 circuit)

In

Ignition ON

4(A)-8(A)

B+



5

BK/WH

Trigger voltage

(electric antenna)

Out

Main unit on.

5(A)-8(A)



6

GN/WH

Rheostat











7

RD

Power supply (+30 circuit)

In



7(A)-8(A)

B+



8

BK

Ground





8(A) - good grounding point

<0.5V





Connector (B)

Pin No.

Cable colour

Component/

function

In/out

Test conditions

Across

Test reading

See

1

BK/GN

Loudspeaker Right Rear (+)

Out

Music playing.

1(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



2

BK/WH

Loudspeaker Right Rear (-)

Out

Music playing.

2(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



3

BN/BK

Loudspeaker Right Front (+)

Out

Music playing.

3(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



4

BN/RD

Loudspeaker Right Front (-)

Out

Music playing.

4(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



5

BN

Loudspeaker Left Front (+)

Out

Music playing.

5(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



6

BN/GY

Loudspeaker Left Front (-)

Out

Music playing.

6(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



7

BN/WH

Loudspeaker Left Rear (+)

Out

Music playing.

7(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.



8

BN

Loudspeaker Left Rear (-)

Out

Music playing.

8(B)-8(A)

0-10V AC. Dependent on volume control. The test reading should vary with the volume of the music.





Connector (C)

Pin No.

Cable colour

Component/

function

In/out

Test conditions

Across

Test reading

See

1

BN/BK

Phone line input, ground

In

-

-

-

Telephone system



2

WH

I-BUS (-)

In/Out

Ignition ON

2(C)-8(A)

2-3 V



3

OG

Phone line input, signal

In

-

-

-

Telephone system



4

GN

I-BUS (+)

In/Out

Ignition ON

4(C)-8(A)

2-3 V



5



No connection











6



No connection











7

RD

Line input CD changer

Left (-)

In

Music playing.

7(C)-9(C)

0-2 VAC. The test reading should vary with the volume of the music.



8

BN

Line input CD changer

Right (-)

In

Music playing.

8(C)-10(C)

0-2 VAC. The test reading should vary with the volume of the music.



9

BU

Line input CD changer

Left (+)

In

Music playing.

9(C)-7(C)

0-2 VAC. The test reading should vary with the volume of the music.



10

GN

Line input CD changer

Right (+)

In

Music playing.

10(C)-8(C)

0-2 VAC. The test reading should vary with the volume of the music.





Main unit connections (DIN connector)





Pin No.

Cable colour

Component/

function

In/out

Test conditions

Across

Test reading

See

1



Line output, external amplifier. Signal, left rear.

Not used.

Out









2



Signal ground, screen











3



Line output, external amplifier.

Signal, left front.

Out



3-2





4



Line output, external amplifier. Signal, right rear.

Not used.

Out









5



Line output, external amplifier.

Signal, right front

Out



5-2





6



Mute control

Out









7



No connection











8



Trigger voltage

Out

Main unit on.



Main unit off.

8-2

B+





0 V